pertaining to the branch of astronomy dealing with the origin and history and structure and dynamics of the universe; "cosmologic science"; "cosmological redshift"; "cosmogonic theories of the origin of the universe"

pertaining to the branch of philosophy dealing with the elements and laws and especially the characteristics of the universe such as space and time and causality; "cosmologic philosophy"; "a cosmological argument is an argument that the universe demands the admission of an adequate external cause which is God"

Having to do with the study of the history, structure, and changes in the Universe. DECAYING ORBIT A path around an object which decreases in size with time. For example, when a satellite enters a decaying orbit above Earth, its orbit size decreases to the point that it enters Earth's atmosphere where it burns up.